Calculating-machine.



H. HOPKINS.

CALCULATING MACHINE.

APPLICATION FILED MAR.29.1912.

1 ,206,1 13. Patented Nov. 28, 1916.

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CALCULATING MACHINE. APPLICATION FILEDMAR. 29. 1912.

1 206,1 1 3. Patented Nov. 28,1916.

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H. HOPKINS. CALCULATING MACHINE.

APPLICATION FILED MAR. 29, I912. 1,206,113. Patented Nov. 28,1916.

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CALCULAHNG MACHINE APPHCATION FILED MAR 29. 1912.

Patented Nov. 28, 1916.

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H. HOPKINS.

CALCULATING MACHINE;

APPLICATION man MAR. 29. 1912.

Patented Nov; 28, 1916.

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H. HOPKINS CALCULAHNG MACHINE.

APPLICATION FILED MAR.29,1912.

Patented Nov. 28, 1916.

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H. HOPKINS.

CALCULATING MACHINE.

APPLICATION men MAR. 29. I912.

1 ,206,1 13. Q I Patented Nov. 28, 1916.

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APPLICATION FILED MAR. 29, I912.

Patented Nov. 28, 1916.

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H. HOPKINS.

CALCULATING MAGHINE.

APPLICATION FILED MAR. 29, 1912. 1,2061 13. Patented Nov. 28, 1916.

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CALCULA'HNG MACHINE.

APPLICATION FILED MAR. 29. 1912v Patented Nov. 28, 1916.

H. HOPKlNS1 CALCULATING MACHINE.

APPLICATION FILED MAR- 29. 1912.

Patented Nov. 28, 1916.

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CALCULATING MACHINE.

APPLiCAT-ION FILED MAR. 29, I912 Patented Nov. 28, 1916.

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H. HOPKINS.

CALCULATING MACHINE.

APPLICAHON FILED MAR. 29. m2.

1 ,206 1 1 3. Patented Nov. 28, 1916.

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H. HOPKINS. CALCULATING MACHINE.

APPLICATION HLED MAR. 29, I9i2. 1 ,206,1 1 3.

Patented N0v..28, 1916.

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H. HOPKINS.

CALCULATING MACHINE.

APPLICATION FILED MAR. 29. 1912.

1 206.1 1 3. Patented Nov. 28, 1916.

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CALCULAHNG MACHINE.

APPLICATION mu) M1119. m2.

1,206.1 1 3; Patented Nov. 28, 1916.

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UNITED STATES HUBERT HOPKINS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO MOON-HOPKINS BILLING MACHINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION.

Specification of Letters Patent.

Patented Nov. 28, 1916.

Application filed March 29, 1912. Serial No. 687,200.

To all whom it may concern:

Be it known that I, Hunnn'r HOPKINS, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Calculating- Machines, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in Which Figure 1 is a vertical longitudinal sectional view through my improved calculating machine, the same being combined with a typewriting machine. Fig. l is a plan view showing the arrangement of the key bars of the calculating machine on the base. Fig. 2 is a side elevational view of the mechanism at the rear of the machine as seen from the left. Fig. 3 is a similar view, certain of the parts shown in Fig. 2 being omitted. Fig. 3 is a detail fragmentary view looking at the edge of the pendant restoring cam. Fig. 1 is a side elevational view of the rear portion of the machine, certain of the parts shown in Fig. 3 being omitted. Fig. 1* is a fragmentary detail view illustrating the connection between the lower end of the bar operated by one of the toothless segments, and as seen from the opposite side from that shown in Fig. 4:. Fig. 5 is a side elevational view partly in section of the upper rear portion of the machine as seen from the left. Fig. 6 is a similar view, the near frame plate being removed to more clearly show the carrying mechanism. Fig. 6 is a fragmentary detail view of one of the registering wheels showing a widened tooth which serves as a tripping projection. Fig. 7 is a diagrammatic illustration of the carrying segments identified with the sub traction mechanism. Fig. 7 is a detail view showing the Zero position of a registering wheel relative to this tripping pawl. Fig. 7 is a similar view showing the 9 position of the one-toothed wheel conjoined to the registering wheel of the highest order and its relation to this tripping pawl. Fig. 7 is a detail view illustrating the idle operation of'the one-toothed wheel relative to the parts controlled thereby. Fig. 8 is a top plan view of the parts shown in Fig. 5. Fig.

9 is a rear elevational view illustrating the subtracting plate and associate parts. Fig. 10 is a vertical longitudinal sectional view showing the subtracting plate and associate parts. Fig. 11 is a detail view of one of the pendants. Fig. 12 is a plan view of the rear ends of the result keys and parts controlled thereby. Fig. 13 is a detail view showing parts operated by the P key. Fig. .14; is a rear elevational view of the construction shown in Fig. 13. Fig. 15 is a detail view of the bell crank lever which moves the pendant restoring cam into and out of operative position. Fig. 16 is a side elevational view showing the subtraction key and parts operated thereby. Fig. 17 is a detail view showing certain of the parts, at the left in Fig. 16, in a different position. Fig. 18 is a side elevational View of the error key and connections illustrating its control of the subtraction plate. Fig. 19 is a diagrammatic view illustrating theT or total key and parts operated thereby when said key is depressed. Fig. 20 is a similar view show-- ing the parts operated by the P or product key when depressed. Fig-21 is a similar view showing the parts operated when the E or extension key is depressed.

Fig. 22 is a similar view showing the parts operated when the O. D. or over-draft key is depressed. Fig. 23 is a detail view illustrating the subtraction plate and its connections. Fig. is a rear elevational view showing the sliding cams and associate parts. I Fig. 25 is a detail view of the printin g mechanism.

This invention relates to a new and useful improvement in calculating machines, and particularly to means whereby subtraction may be performed.

The ordinary method of subtracting the 

